Adjustable tappet-rod head



' July 6, 1926.

A. E. BREITENFELT ADJUSTABLE TAPPET ROD HEAD Filed May 8. 1925 I Patented July 6, 1926. 1,5915% UNITED-STATES PATENT OFFICE.

ARTHUR E. BREITENFELT, F HARTFORD, WISCONSIN.

ADJUSTABLE TAPPET-ROD HEAD.

Application filed May 8, 1925. Serial No. 28,857.

This invention relates to adjustable tappet aperture 6 opening through its upper end. rod heads. This larger aperture is internally threaded The tappet rods used in internal combusadjacent its upper end, and receives the extion engines give trouble due to relative variternally threaded cap 7 which is preferably 6 ations in the length of the rods, and the of shell like formation and provided with an cooperating parts of the engine, such variaaperture 8, as shown in Figure 2. tion being due to several causes such, for The upper end 9 or the cap-7 is squared instance, as temperature changes of the parts or otherwise shaped to receive a wrench to and wear. The result of this variation is a permit relative adjustment between the cap 1 noisy operation of the tappet rod which is 7 and the plug 4. It is to be noted that annoying and which also slightly varies the means are provided for locking these parts action of the engine and alters its efiiciency. temporarily against motion, such means Thi in ti n i d ign d to ov rco comprising slots 10 formed in the upper end the above noted defects, and objects of the of the plug 4:, and a slot 11 formed at right invention are to provide a tappet rod head g esw he slots 10 and in the portion 9. which will cause a quiet action of the tappet A clip or locking member 12 is provided d nd .11 ditio hi h i vid d with arms at rlght angles to each other, and ith ii i ldi tio d ith an dj t, these arms are adapted to be slipped into the able member to vary the degree of yielding l t 11 and 10 in the members 9 and 4, of such portion, and which is provided with r spe tlv ly, and to thus temporarily lock a very simple and reliable locking device for the plug and cap 7 against relative motion, holding the adjustable me nher in correct The lOClUIlg member 12 cannot be displaced iti i t i d t t ti when the plug is screwed into the cylindrical An embodiment of the invention is shown P f he he d, as Shown in Figure 4, in the accompanying drawings, in whi h as theunner cylindrical walls of the mem- Figure l is an elevation partly broken her 3 limit lateral motion of the member 12. away f th t t d h d h i it i The plug 18 held against motion with relal ti t th valve d t t d tion to the cylindrical portion 3 by means Figure 2 is an enlarged section through f a k 111113 as Shown part cularly in the lower end of the head. lllgulfes 1 (1nd Fi 3 i a b tt i f th t t It is preferable to provide the lower end rod head of the head 3 with flattened portions or cut- Figure 4c is a sectional view on the line y P for the pti n of a 4 4 f Fi 2 wrench to ald 1n the convenient manipula- 35 The tappet rod head has been shown as n of the P forming a portion of the valve structure, but r g is p ided Which has one it is to be understood that it may be located Portlon p J through the aperture 5 upon and carried by the tappet rod itself, n the P g and W P has a reduced p01- if desircd,one form of the invention being U011 located Wlthln the aperture 5 in considered suflicient for the purpose of illusthe P g and Preferably guided Within the 95 n ti aperture 8 of the cap 7, as shown in Fig- Referring to the drawings, particularly Figure 1, it will be seen that the usual tappet Thls p hg 1S p f f Wlth an integr a1 rod 1 i b d t Operate th Valve 2 collar 16 intermediate its ends which is 45 However, a head is interposed between the adapted t rest 111 11 he Shoulder formed alve and the rod, This head comprises a, at the pOIllt Of Union Of the aperture 6 and cylindrical portion 3 which in the form the aperture 5 through the plug 4. shown is a unitary structure with the valve, A helical spring 17 surrounds the reduced This cylindrical member 3 has a closed upportion 15 of the plunger and bears at op- 50 per end and an open internally threaded posite ends against the collar 16 and the lower end for the reception of the threaded lower end of the cap 7 It is clear that the plug 4. This plug is provided with .a exact adjustment of the spring pressure may wrench receiving lower portion, as shown, be easily secured by screwing the cap 7 and is provided with an aperture 5 opening inwardly or outwardly of the plug 4 when through its lower end, and with a larger the plug is removed from the cylindrical member 3. Thereafter, the locking member 12 is slipped into place and the plug reinserted in the cylindrical member.

In operation 7 the tappet rod 1 bears against the lower end of the plunger in the form shown and lifts the valve through the medium of the spring '17.

It is to be noted that the spring 17 accommodates slight variations due to wear and other variations, which alterthe length of the rod and thus insures a very quiet operation oi the tapp' t rod at all times.

From the forege' dcscriotion and ac companying illustr 4, ticular attention is called to the that that this invention in brief terms is primarily directed to a yielding plungl er associated with a practical adjustable feature, it being understood that the units comprising the plunger and its associated adjustable element can be readily applied to iither an m'erhcad motor valve structure or that of the ordinary type.

Although the invention has been described in considcrabha detail, it is to be understood that the invention may be variously embodied anl is, therefore, to be limited only as claimed.

I claim:

1. A tappet rod head-comprising a cylindrical member lniving a closed end and an open end, a plug screwed into the open end, a plunger slidable through said plug, a helical. spring surrounding said plunger and urging it outwardly, and means for adjusting the pressure of: said spring.

2. A tappet rod head comprising a cylindri :al member having a closed end and an open end, a plug screwed into the open end, a plunger slidable through said plug, a helical spring surroi-lnding said plunger and urging it outwardly, means for adjust-- ing the pressure of said spring, and a locking member for holding said adjusting means against motion.

3. A'device adapted for use with tappet rods comprising an elongated cylindrical member having an open end, a plug screwed into said open end and having an enlarged aperture through its inner end, and a smaller aperture through its outer end, a plunger titted within said plug and projecting through the smaller aperture and having a collar formed thereon, a spring positioned within the lar 'er aperture of said plug and bearing against said collar, and a cap screwed'into said plug and adjustably compre sing said spring.

4-. A device adapted for use with tappet rods comprising an elongated cylindrical memberhaving an open end, a plug screwed into said open end and having an enlarged aperture through its inner end, and a smaller aperture through its outer end, a

plunger titted within said plug and projecting through the smaller aperture and having a collar formed thereon, a spring positioned within the large aperture of said plug and bearing against said collar, a cap screwed into saidplug and adjustably compressing said spring, said )lug and said cap having right angle slot-s "oi-med therein, and a right angle member having its arms removably .Feated in said slots to hold said cap and plug against relative motion.

In testimony that I claim the foregoing I have hereunto set my hand at Hartford, in the county of \Vashington and State of \Visconsin.

ARTHUR E. BREITENFELT. 

